These collections are a gold mine of online primary source materials collected by the world's largest library, The Library of Congress in Washington, D.C. United States History is especially well-represented, though the collection breadth is extensive. Contents include as Civil War photographs and music, U.S. slave narratives, women suffrage materials, historic advertising, early maps, music recordings and scores, English dialect recordings, gold rush narratives, cartoons, daguerreotypes, papers of distinguished individuals, Look Magazine photos, labor materials, posters, and much more.